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how can I make sure that my gpu is heath and work properly?
It is fine, don't worry about it. I'm surprised they even bothered to send you the boxI ordered a custom gaming pc and when I received that, I noticed my gpu box foam is damaged!?
Now I really concerned and upset that is my new gpu and system second-hand or refresh!?
https://~ibb.co~/zTkQbKbs

Guru3D include 3D Mark scores in their reviews, but I can't check for you, because I don't know which benchmark/version you ran, or what the card is.I did that and on 1080 extreme settings, I got 13560...
Now I am not sure is the score proper for this model or not!?